package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import io.swagger.annotations.Api;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Slf4j
@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private CategoryMapper categoryMapper;

    @Transactional // 开启事务，涉及多张表的增删改操作
    public void addDish(DishDTO dto) {
        //1.构造菜品基本信息数据，将其存入dish表中
        Dish dish = new Dish();
        //拷贝属性值
        BeanUtils.copyProperties(dto, dish);
        //调用mapper保存方法
        dishMapper.insert(dish);



        //2.构造菜品口味列表数据，将其存入dish_flavor表中
        List<DishFlavor> dishFlavorList = dto.getFlavors();
        if (dishFlavorList != null && dishFlavorList.size() > 0) {
            //关联菜品id
            dishFlavorList.forEach(flavor -> {
                flavor.setDishId(dish.getId());
            });

            //调用mapper保存方法
            dishFlavorMapper.insertBatch(dishFlavorList);
        }


    }

    /**
     * 菜品分页查询
     * @param dto
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dto) {
        //1. 设置分页参数
        PageHelper.startPage(dto.getPage(), dto.getPageSize());

        //2.调用mapper列表查询方法，强转成page
        Page<DishVO> page = dishMapper.page(dto);

        //3.封装PageResult对象并返回
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 删除菜品
     * @param ids
     */

    @Transactional
    public void delete(List<Long> ids) {
        //1、删除菜品前需要判断是否起售，起售中的不允许删除
        ids.forEach(id->{
            Dish dish = dishMapper.selectById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });


        //2、判断菜品是否被套餐关联，关联了也不允许删除
        Integer count = setmealDishMapper.countByDishId(ids);
        if (count > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }


        //3、删除菜品基本信息dish表
        dishMapper.deleteBatch(ids);

        //4、删除菜品口味列表信息 dish_flavor表
        dishFlavorMapper.deleteBatch(ids);
    }

    @Override
    public DishVO getById(Long id) {
        DishVO dishVO = new DishVO();

        //1、根据id查询菜品基本信息
        Dish dish = dishMapper.selectById(id);
        BeanUtils.copyProperties(dish, dishVO);
        //2、根据菜品id查询口味列表数据
        List<DishFlavor> dishFlavorList=dishFlavorMapper.seletchByDishId(id);
        dishVO.setFlavors(dishFlavorList);

        //3、构造dishvo对象并返回
        return dishVO;
    }

    @Transactional
    public void update(DishDTO dto) {
        //1、修改菜品的基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dto, dish);
        dishMapper.update(dish);

        //2、修改菜品口味信息
        //由于口味列表有可能触发删除增加，修改操作，所以全部删除旧数据，再添加新数据

        dishFlavorMapper.deleteByDishId(dto.getId());
        List<DishFlavor> dishFlavorList=dto.getFlavors();
        if (dishFlavorList != null && dishFlavorList.size() > 0) {
            //关联菜品id
            dishFlavorList.forEach(flavor -> {
                flavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(dishFlavorList);
        }

    }

    /**
     * 菜品起售停售状态更改
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = dishMapper.selectById(id);
        dish.setStatus(status);
        dishMapper.update(dish);
    }

    /**
     * 根据分类Id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> getByCategoryId(Integer categoryId) {
        return dishMapper.getByCategoryId(categoryId);
    }

    /**
     * 分类查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品查询对应口味、分类
            List<DishFlavor> flavors = dishFlavorMapper.seletchByDishId(d.getId());
            Category category = categoryMapper.getById(d.getCategoryId());
            dishVO.setFlavors(flavors);
            dishVO.setCategoryName(category.getName());
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }
}
